理化学研究所 計算科学研究機構

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第95回

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第95回
日時: 2016年7月13日(水)、15:30 – 16:30
場所: AICS 6階講堂

・講演題目: Introduction of runtime fluctuations
・講演者: 熊畑 清(ソフトウェア技術チーム)
※発表は日本語、スライドは英語。

講演要旨: 詳細を見る

During an operation, an application runtime occasionally becomes longer or shorter than previously measured runtime despite running under the same conditions (e.g., with the same load module and input parameters). We call this issue "runtime fluctuation".

The runtime fluctuations disturb efficient operations of the K computer. If runtime exceeds the maximum elapsed time given by a job script, the computational resources will be uselessly consumed due to the incomplete termination of the program. And if runtime is getting short, the job running order should be disordered and rearranged by the job scheduler.

Therefore, Operations and Computer Technologies Division (運用技術部門) continued to investigate these issues and resolve them. In this talk, I will show some cases of the runtime fluctuations and solutions.